diff --git a/package.json b/package.json
index cb726fa..2d13811 100644
--- a/package.json
+++ b/package.json
@@ -63,6 +63,7 @@
   },
   "dependencies": {
     "chalk": "^1.1.1",
+    "magic-string": "^0.15.0",
     "minimist": "^1.2.0",
     "source-map-support": "^0.4.0"
   },
diff --git a/src/Bundle.js b/src/Bundle.js
index 95248b1..65bf133 100644
--- a/src/Bundle.js
+++ b/src/Bundle.js
@@ -1,4 +1,4 @@
-import MagicString from 'magic-string';
+import { Bundle as MagicStringBundle } from 'magic-string';
 import first from './utils/first.js';
 import { blank, forOwn, keys } from './utils/object.js';
 import Module from './Module.js';
@@ -268,7 +268,7 @@ export default class Bundle {
 		// Determine export mode - 'default', 'named', 'none'
 		const exportMode = getExportMode( this, options.exports, options.moduleName );
 
-		let magicString = new MagicString.Bundle({ separator: '\n\n' });
+		let magicString = new MagicStringBundle({ separator: '\n\n' });
 		let usedModules = [];
 
 		this.orderedModules.forEach( module => {
diff --git a/src/Module.js b/src/Module.js
index e222b3a..e05f04c 100644
--- a/src/Module.js
+++ b/src/Module.js
@@ -491,15 +491,16 @@ export default class Module {
 						const declaration = this.declarations[ name ];
 
 						if ( declaration.exportName && declaration.isReassigned ) {
-							magicString.insert( statement.end, `;\nexports.${name} = ${declaration.render( es6 )}` );
+							magicString.insertLeft( statement.end, `;\nexports.${name} = ${declaration.render( es6 )}` );
 						}
 					});
 				}
 
 				if ( statement.node.isSynthetic ) {
 					// insert `var/let/const` if necessary
-					magicString.insert( statement.start, `${statement.node.kind} ` );
-					magicString.overwrite( statement.end, statement.next, ';\n' ); // TODO account for trailing newlines
+					magicString.insertRight( statement.start, `${statement.node.kind} ` );
+					magicString.insertLeft( statement.end, ';' );
+					magicString.overwrite( statement.end, statement.next, '\n' ); // TODO account for trailing newlines
 				}
 			}
 
@@ -530,7 +531,7 @@ export default class Module {
 					}
 
 					if ( reference.isShorthandProperty ) {
-						magicString.insert( end, `: ${name}` );
+						magicString.insertLeft( end, `: ${name}` );
 					} else {
 						magicString.overwrite( start, end, name, true );
 					}